a small mound of earth thrown up by a mole burrowing near the surface:the frosts and lack of plant growth will serve to make molehills stand out more
Phrases
make a mountain out of a molehill
exaggerate the importance of something trivial:a barrister must make mountains out of molehills, to find a point of law where none had previously been known to exist
molehill in other Oxford dictionaries
Definition of molehill in the US English dictionary
